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1、Availableonlineatwww.sciencedirect.comPowderTechnology184(2008)205–213www.elsevier.com/locate/powtecDEMsimulationoftheparticledynamicsintwo-dimensionalspoutedbedsaa,⁎aabX.-L.Zhao,S.-Q.Li,G.-Q.Liu,Q.Yao,J.-S.MarshallaKeyLaboratoryforThermalScienceandPowerEngineeringoftheMinistryofEdu
2、cation,DepartmentofThermalEngineering,TsinghuaUniversity,Beijing,100084,ChinabSchoolofEngineering,TheUniversityofVermont,Burlington,VT05405,USAAvailableonline4December2007AbstractADiscreteElementMethod(DEM)isusedtogetherwiththecontinuummodelofturbulentfluidstosimulatetheperiodicspou
3、tingofgranularsolidsinatwo-dimensionalspoutedbed.Thebediscontainedinarectangularcolumnof152mmwidthand15mmdepthwithataperedbase.Glassbeadswithadiameterof2mmareusedasbedmaterial.SimulationsusingtheDEMtogetherwithalowReynoldsnumberk–εturbulencemodelforthefluidphaseyieldpredictionsofthe
4、unstablespoutregime,characterizedasaperiodicupward-movingparticlejet.Thesimulationresultscomparewelltoexperimentaldataobtainedusingaparticleimagevelocimetry(PIV)technique,includingfluidflowfields,time-averagedparticlevelocityprofiles,andspoutshape.Finally,DEMpredictionsfordistributi
5、onofdragandnetforceontheparticles,particleconcentrationfields,gasvelocityandturbulencefieldarediscussed.©2007ElsevierB.V.Allrightsreserved.Keywords:Spoutedbed;Particleflowpattern;DiscreteElementMethod;Particleimagevelocimetry;Fluidization1.IntroductionTheDiscreteElementMethod(DEM),w
6、hichcanresolveparticleflowbehaviorsatanindividualparticlelevel,hasbeenSpoutedbedsarewidelyusedinphysicalandchemicalwidelyusedforstudyinggranular-fluidflowinfluidized-bedapplicationssuchasdrying,coating,granulation,combustion,systems[7–12].However,DEMsimulationshavenotbeenasgasificat
7、ion,chemicalvapordeposition,etc.,inordertoprovidesuccessfulforsimulatingthebehaviorofspoutedbeds[13–17].efficientmixingrateandhighgas–solidcontactareaforcoarse,Takeuchietal.[14]reportthataprimarydifficultyisthattwo-irregulargranularmaterials[1–5].Differentfromconventionaldimensional
8、DEMsimulationhasser
